Natural and anthropogenic sources of East Asian dust

Li, Gaojun; Chen, Jun; Ji, Junfeng; Jun, Yang; Conway, Tim M.

doi:10.1130/g30031a.1

Cited by 112 publications

(109 citation statements)

References 34 publications

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“…The 87 Sr/ 86 Sr ratio of snail in different regions and ages varies from 0.71055 to 0.71117 with the variation of just 0.00062 [21], indicating that stable source of Sr and Ca in soil solution and thus the authigenic carbonate. Under the extreme condition that the 87 Sr/ 86 Sr ratio of detrital carbonate is identical to the average marine carbonate of about 0.7077, lower than that of carbonate in loess and all PSAs [10]; products of silicate weathering have 87 Sr/ 86 Sr ratio identical to the bulk silicate (0.7185) [28] without preferential weathering of micas with high 87 Sr/ 86 Sr ratio [29]; taking the highest 87 Sr/ 86 Sr ratio of snail (0.71117) as that of the soil solution, it can be estimated that at most 32% of Sr in loess soil solution is derived from silicate weathering. The Ca/Sr ratios of detrital carbonate and silicate are about 860 mol/mol [21] and 140 mol/mol [27], respectively.…”

Section: Mineral Contentmentioning

confidence: 98%

Geochemical studies on the source region of Asian dust

Chen

Gao-jun

2011

Sci. China Earth Sci.

160

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The North China and the neighbouring Mongolia in Asian Interior is characterized by extremely dry climate, resulted in one of the world's major dust emission centres. Deciphering the source region of Asian dust is critical for revealing the mechanism of the dust production, interpreting the paleo-environmental records of eolian deposits, predicting the overall environmental effects of dust, and setting the strategies for the control of contemporary dust storms. This paper summarizes the geochemical methods applied to the source tracing of Asian dust. Nd-Sr isotopes were the most extensively studied source tracer of Asian dust and have been successfully applied in many cases. Geochemistry of detrital monomineral shows great theoretical advantages in source tracing and deserves further studies. The short-range transportation of Chinese loess with direction similar to that of the prevailing near surface wind is revealed. Source tracing also shows that the Asian dust has two ultimate material sources from the northern margin of the Tibetan Plateau and the Central Asian Orogen, which confirms the importance of mountain processes in the production of silt eolian particles. Based on the recent progresses on the source tracing of Asian dust, discussions are expanded on the natural background of Asian dust storms and potential anthropogenic influence, the materials evolution of the source regions of Asian dust and its relationships with climate changes and Tibetan uplift, and the role of Tibetan uplift in the Asian dust system. desert, loess, Asian dust, dust storm, Tibetan Plateau Citation:Chen J, Li G J. Geochemical studies on the source region of Asian dust.

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Section: Mineral Contentmentioning

confidence: 98%

Geochemical studies on the source region of Asian dust

Chen

Gao-jun

2011

Sci. China Earth Sci.

160

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“…Anthropogenic mineral dust can also influence air quality and human health through the processes of their emission, transport, removal, and deposition (Aleksandropoulou et al, 2011;Chen et al, 2013;Huang et al, 2014Huang et al, , 2015aKim et al, 2009;Li et al, 2009;Mahowald and Luo, 2003;Zhang et al, 2005Zhang et al, , 2015. Ginoux et al (2010) estimated that anthropogenic dust accounts for 25 % of all dust aerosols using observational data from satellite products combined with a land-use fraction dataset.…”

Section: Introductionmentioning

confidence: 99%

Optical and microphysical properties of natural mineral dust and anthropogenic soil dust near dust source regions over northwestern China

et al. 2018

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Abstract. Mineral dust aerosols (MDs) not only influence the climate by scattering and absorbing solar radiation but also modify cloud properties and change the ecosystem. From 3 April to 16 May 2014, a ground-based mobile laboratory was deployed to measure the optical and microphysical properties of MDs near dust source regions in Wuwei, Zhangye, and Dunhuang (in chronological order) along the Hexi Corridor over northwestern China. Throughout this dust campaign, the hourly averaged (±standard deviation) aerosol scattering coefficients (σ sp , 550 nm) of the particulates with aerodynamic diameters less than 2.5 µm (PM 2.5 ) at these three sites were sequentially 101.5 ± 36.8, 182.2 ± 433.1, and 54.0 ± 32.0 Mm −1 . Correspondingly, the absorption coefficients (σ ap , 637 nm) were 9.7 ± 6.1, 6.0 ± 4.6, and 2.3 ± 0.9 Mm −1 ; single-scattering albedos (ω, 637 nm) were 0.902 ± 0.025, 0.931 ± 0.037, and 0.949 ± 0.020; and scattering Ångström exponents (Å sp , 450-700 nm) of PM 2.5 were 1.28 ± 0.27, 0.77 ± 0.51, and 0.52 ± 0.31. During a severe dust storm in Zhangye (i.e., from 23 to 25 April), the highest values of σ 2.5 sp (∼ 5074 Mm −1 ), backscattering coefficient (σ 2.5 bsp , ∼ 522 Mm −1 ), and ω 637 (∼ 0.993) and the lowest values of backscattering fraction (b 2.5 , ∼ 0.101) at 550 nm and Å 2.5 sp (∼ −0.046) at 450-700 nm, with peak values of aerosol number size distribution (appearing at the particle diameter range of 1-3 µm), exhibited that the atmospheric aerosols were dominated by coarse-mode dust aerosols. It is hypothesized that the relatively higher values of mass scattering efficiency during floating dust episodes in Wuwei and Zhangye are attributed to the anthropogenic soil dust produced by agricultural cultivations.

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“…In this paper we refer to this source region as Asian interior. Fine particles from these deserts are mainly derived from the widely distributed proluvial deposits associated with intensive Tibetan uplift (Derbyshire et al, 1998;Ji et al, 1999;Li et al, 2009a). The dominance of dust from the northern margin of the Tibetan Plateau, therefore, suggests a close link between aeolian deposition in the CLP and the North Pacific and the evolution of the Tibetan Plateau, i.e., the uplift and growth of the Tibetan Plateau not only gives rise to the increasingly drier climate conditions, but also generates the detrital materials favoring dust production (Chen et al, 2007).…”

Section: Drying Of the Dust Source Regionmentioning

confidence: 99%